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Re: XOR Swap still viable algorithm? 17 Years Ago by mcldev XOR is a assembler command. So... it executes very fast. Inside … operations on the processor which are generally more expensive than XOR operations. But here's the deal by the time you… program in C++ using XOR is not recommended unless you are performing special bitwise operations… Re: xor linked list 17 Years Ago by phoenixlsk …are a curious use of the bitwise exclusive disjunction (XOR) operation, here denoted by ⊕, to decrease storage requirements… –> next –> next –> next –> An XOR linked list compresses the same information into one address field… by storing the bitwise XOR of the address for previous and the address… Re: xor 12 Years Ago by cereal …php $a = true; $b = true; $c = false; echo ($a xor $b) ? 'true':'false'; # output: false because $a and $b are… both true echo ($a xor $c) ? 'true':'false'; # output: true because $a is…can be written also like this: <?php if($a xor $b) { echo 'true'; } else { echo 'false'; } ?&… XOR HELP 14 Years Ago by jamesbondbest HERE IS SIMPLE XOR PROGRAM WHEN I TRY TO COMPARE TWO SAME STRINGS ENCRYPTED … Re: XOR HELP 14 Years Ago by tux4life … useful anyway. [B]**[/B] - [ICODE][I]nul-byte[/I] [B]XOR[/B] [I]character of encryption key[/I][/ICODE] will reveal… xor 12 Years Ago by arcticM so i checkied how to swap 2 variables without a 3rd one and I found this solution - $x ^= $y ^= $x ^= $y; but I don't understand what the xor (^) does! never used it before and php.net has some strange examples I don't get.. can someone explain to me what is this thing and how it works? Re: xor 12 Years Ago by diafol Example If you have two variables ($a and $b), which for the sake of argument can each be true or false. Logical operators AND / OR will return TRUE if: AND: ONLY when $a AND $b are both true OR: When either $a OR $b is true OR when both are true XOR: Only when either $a OR $b is true BUT NOT when both are true Re: xor 12 Years Ago by diafol You need to look at binary: 12 = 1100 9 = 1001 **XOR** The exclusive either/or bits here: 0101 The 1000 isn't as it's common to both numbers 101 binary = 5 in decimal XOR Swap still viable algorithm? 17 Years Ago by ShawnCplus …supposedly faster but the shear coolness of an XOR swap makes it more attractive to me.…? For anyone that doesn't know what an XOR swap is here goes [code=c++] int first…;\nSecond: "<< second << endl; // XOR Swap first ^= sec; sec ^= fir; fir ^= sec; //…array [code=c++] cout<<" XOR Swap"<< endl; cout<<… Re: XOR encryption newbie 15 Years Ago by tux4life …you apply this approach to bits (that is: apply XOR bitwise): Say, you have two bytes which respectively look…the whole thing by exactly doing the same: (bitwise) XOR both, the encrypted data and the encryption key together,… data[/I]) 00001101 ([I]encryption key[/I]) -------- ([B]XOR[/B]) 10110111 ([I]decrypted data, original data[/I])[/CODE] So… XOR Encryption problem 14 Years Ago by Ricky65 …going wrong. Advice appreciated. Ricky My code: [CODE]//XOR Encryption #include <stdio.h> #include &…lt;string.h> //XOR Encryption key char XORkey [] = "simples"; void…char output[] = "C:\\test_encrypted.txt"; //XOR data and write it to file XOR_encrypt(input, output, … Re: XOR Swap still viable algorithm? 14 Years Ago by arkoenig … operations on the processor which are generally more expensive than XOR operations. [/QUOTE] Really? Why do you think so? …one fetch and one store. An XOR requires two fetches, one store, and the XOR operation itself. So why do …you think that three XOR operations would be faster than… XOR encoder 13 Years Ago by chubakueno … "An error happened";} } file.close(); } int xor(int a, int b)// I know about the ^ operator,… is only for learning purposes { _asm{ mov eax,a xor eax,b } } char* encode_file(char * memblock, char * …(i=0; i < size; i++){ *(encoded_char+i) = xor(*(memblock+i),*((key+i%strlen(key)))); } return encoded_char; } int main… Re: xor linked list 17 Years Ago by Ptolemy … advantage of the butterfly effect using XOR. If you take the XOR of two values and XOR it with either value, you get… the other value: [code] 123 XOR 456 = 435 (butterfly radix) 435 XOR 123 = 456 435 XOR 456 = 123 [/code] They're obscure… XOR binary addition 12 Years Ago by somjit{} i was searching for a code to perform binary XOR addition. Exams coming up, and needed to a quick…ip_base); result=decNum1^decNum2; // dec equivalent of XOR addition printf("\n xor output:\n\n "); for(i;i<…, Info & Coding theory more generally refers binary XOR as "modulo-2 addition". :) Re: XOR Swap still viable algorithm? 17 Years Ago by vijayan121 the xor swap algorithm fails if you try to swap a variable … Re: XOR Swap still viable algorithm? 14 Years Ago by 0dark As said before XoR fails if you try to swap a variable with itself. Not only that but it also fails if you try to swap variables with the same value. Try it and you'll see. I personally use std:: Swap(a,b) even though I think it's slower.. Sorry, didn't read the rules before posting. u.u Re: XOR Gate - Digital Design 14 Years Ago by emilo35 …) * D) + (B(not) * C * D) a complete XOR gate. In that case, it would be some kind of… incomplete, inverted XOR gate that I've never heard of, so …. However, I have some guidelines for you: XOR means exclusive OR, which in turn means that …case is if you would like an ordinary XOR gate with the ability to enable/disable output … XOR Equation Expansion 15 Years Ago by einjelle … included in our specifications that the user could also input XOR operations, which my parser couldn't handle. So now,… I am looking for existing codes in expanding XOR equations so that the expanded equation would just be the… be substituted and processed by the parser. like this one: /*XOR = & */ (A&(B&C)) = ABC + A'B… XOR without declared variables 14 Years Ago by p@rse … and finally figured out how bit-level works when using XOR, but most of the time, the vars were already declared… key I am stuck. But see when I want to XOR pass ^ key I want the key to know the pass…(pass) << endl; chLen = strlen(pass); //Count strlen for XOR encryption cout << " # of Integers: " <<… XOR Gate - Digital Design 14 Years Ago by speedy94519 I have a reduced function and one of the product terms is: B * C(not) * D + B(not) * C * D. Is that considered an XOR gate? Im aware that B * C(not) + B (not) + C is an XOR gate because When i do the truth table it has the characteristic of an XOR gate, but Im not sure about that terms above. Thank you XOR linked list 12 Years Ago by shanki himanshu Since in XOR linked list current pointer store the XOR of addresses of previous and next node. my question is how do we XOR two pointers? Re: XOR Gate - Digital Design 14 Years Ago by emilo35 If i'm not mistaken, (B * C(not) * D) + (B(not) * C * D) can be rewritten as (B XOR C) * D I'm not sure if this is what you're after. But if I were to construct a triple gate XOR, I think it would look like this: (B(not) * C(not) * D) + (B(not) * C * D(not)) + (B * C(not) * D(not)) Good luck to you! Emil Olofsson Re: XOR Encryption 13 Years Ago by doug65536 … the key. You take those extremely random numbers and xor them with the data, giving you seemingly completely random …seed (key), and do the xor operation again on the encrypted data. Doing an xor again on the encrypted data with… the same number will undo the original xor (that you did when encrypting) into the original data.… Xor Logical Operator in C++ 15 Years Ago by n.utiu WE have the && operator, the || operator, but xor is only implemented as '^' . And this causes a lot of confusion. Let's take this case: 2 == 2 ^ 2 generates a logical operation instead of bitwise operation , therefore returning a true value. What do yo think: Should the C++ standard have a xor logical operator? Why ? Re: Xor Logical Operator in C++ 15 Years Ago by mrnutty …;1163467]WE have the && operator, the || operator, but xor is only implemented as '^' . And this causes a lot of…. What do yo think: Should the C++ standard have a xor logical operator? Why ?[/QUOTE] Usually, noobs have problems with this… Re: Xor Logical Operator in C++ 15 Years Ago by Banfa I have been programming for 20 years and I can say I've missed the absence of a Logical XOR operator where as I know for a fact I would miss the absence of a Bitwise XOR operator. Re: XOR Gate - Digital Design 14 Years Ago by speedy94519 yeah thats what I was after. SO, (B * C(not) * D) + (B(not) * C * D) , is considered an XOR type gate correct? Re: XOR Gate - Digital Design 14 Years Ago by Haneen Dweikat hey ... it's D*(B XOR C ) Re: XOR linked list 12 Years Ago by nmaillet The `^` is used for XOR operations; see [Boolean Operations](http://www.cplusplus.com/doc/boolean/).